Saturdays course: approx 42 miles, modified Lemans start from pits out 1/2 mile to turn bouy and then back into Indian River. Race runs through Indian River then along the West side of Mullett Lake and entering Cheboygan River and running its full length to a turn around buoy in Cheboygan. The course then follows the same route back to a finish line at Devoe Beach in Indian River. Sundays course: approx 42 miles, modified Lemans start from pits across Burt Lake and then North to entrance of Crooked River. Course runs through Crooked River and into and around Crooked Lake making 3 check points and then back into Crooked River. Course then continues South along the West side of Burt Lake then across the lake into the Indian River. The race travels the full length of Indian River to a check point at Mullett Lake and then back through Indian River to the finish line at Devoe Beach. The Top O' Michigan Outboard Racing Club welcomes new participants and race veterans alike.

The Top O' Michigan Outboard Marathon National Championship race will celebrate its 76th anniversary in 2024.
Founded in 1949, the race which is known as the world's toughest outboard marathon, has grown to legendary status in the boat racing world. For more than 70 years, boat racers from across the United States, as well as other countries, have been coming to northern Michigan to race across the rivers and lakes of the Inland Water Route in an adventure that tests both drivers and their boats.
For an event to reach its 76th running year is impressive. There have been many changes over the years ranging from the course layout to the registration fees – but one thing is still the same – the passion.
We've got cash prizes, apparel, catered dinners, and all of the usual fan fare! LETS GO RACING!